"No offence to Joel or Jeff, they are doing something nice, but we don't need more Joels or Jeffs, that area already have been covered."

Sorry, but that's simply terrible advice. That's like telling Kafka, "don't write your short stories, Poe already has that style covered."

I agree we don't need a bunch of lame Joel/Jeff knockoffs. But we certainly shouldn't discourage people from trying to stand on their shoulders to create something better.